@conference {104986,
	title = {collectorless flotation of oil shale},
	booktitle = {SME Annual Meeting},
	year = {2016},
	month = {Feb 2016},
	address = {USA},
	author = {S.E.El-Mofty and N.Khairy and A.M. El-Kammar and A.A.El-Midany}
}
